Underdrive pulley balanced with rotating assembly?

[SILV BLT]

Ok, I realize that the whole underdrive pulley thing has been beaten to death in regards to whether or not there's any gain. I'm not looking to create another one of those threads where there's 50 posts and only 5 of them are useful. My searching has found that a lot of people say that there's been significant issues with uneven bearing wear on cars that have switched from the dampened OEM pulley to a non-dampened underdrive pulley. I believe it was either Buschur or Slowboy in one of the posts that has said they will not put underdrive pulleys on any of their shop cars from the poor experiences that they've had. My purpose for creating this thread though is to get some knowledgable replys on whether balancing the rotating assembly with the underdrive pulley will negate the bearing wear issue. I'm preparing to rebuild my block and I got a good deal on an Unorthodox crank pulley from a friend. I'm just trying to figure out whether I should just sell it for profit or keep it. Remember guys, I want to keep this thread devoted to the question of whether balancing the rotating assembly with the pulley helps or not. Thanks!

 

[steel_3d]

It won't help. The issue is that the solid pulleys don't dampen the harmonic vibrations of the crank. That's what harmonic dampers, including the stock pulley, are for.

I would guess the pulley will already be pretty well balanced, plus it's small and light, so it will make practically no difference in the overall balance of the assembly.

 

[SILV BLT]

It won't help. The issue is that the solid pulleys don't dampen the harmonic vibrations of the crank. That's what harmonic dampers, including the stock pulley, are for.

I would guess the pulley will already be pretty well balanced, plus it's small and light, so it will make practically no difference in the overall balance of the assembly.

Awesome, thats what I wanted to know. Why is it though that the 420a motor and lots of Honda motors can get away with non dampened pulleys with no ill effects?

 

[talon96tsi]

Actually, i have yet to see a fast b series powered car without a dampener.

 

[Defiant]

Awesome, thats what I wanted to know. Why is it though that the 420a motor and lots of Honda motors can get away with non dampened pulleys with no ill effects?

Why do they have fewer incidents of crankwalk? Some things just "are".

 

[steel_3d]

Maybe they don't put enough stresses on the crank to cause enough deflection to be a problem? I dunno.

The 4g63 will run without an undamped pulley for a while too. If you don't boost it and don't rev it past 4k it'll last foreveer